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body{--surface:#fff;--surface-soft:#f6f8fb;--text-main:#202b3c;--text-soft:#718096;--border:#e5e9ef;--action:#2867de;--page:#fff}
body[data-theme=dark]{--surface:#171e29;--surface-soft:#1f2835;--text-main:#e8eef8;--text-soft:#a7b4c9;--border:#303b4d;--action:#8cb8ff;--page:#10151e;--ink:var(--text-main);--muted:var(--text-soft);--line:var(--border);--blue:var(--action);--blue-light:#22334e;--blue-dark:#b0cdff;color-scheme:dark}
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.sidebar,.workspace{transition:transform .22s,margin-left .22s}.sidebar{transition:transform .22s}
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/* Round the functional icon system without changing the supplied subject artwork. */
svg{stroke-linecap:round;stroke-linejoin:round}.nav-item{border-radius:14px}.subject-icon,.tool-card-icon,.choice-icon,.pathway-symbol,.recent-icon{border-radius:17px}.icon-button{border-radius:11px}
/* Dark surfaces and readable text across the full application, including legacy pages. */
body[data-theme=dark]{background:var(--page);color:var(--text-main)}
body[data-theme=dark] :is(.workspace,.topbar,.sidebar,main){background:var(--page);border-color:var(--border)}
body[data-theme=dark] :is(.note-card,.practice-card,.core-card,.tool-card,.rail-card,.steps-card,.guide-resource,.pathway,.settings-card,.quiz-shell,.review-card,.reading-panel,.recent-practice>a,.search-dialog,.account-dialog,#subjects-dialog){background:var(--surface);border-color:var(--border);color:var(--text-main)}
body[data-theme=dark] :is(h1,h2,h3,h4,.brand,.brand-blue,.reading-panel h2,.core-link strong,.setting-row strong,.study-summary strong,.reader-summary,.quiz-question h1,.review-title h3,.select-label,.library-active,.search-result strong,.option-letter){color:var(--text-main)}
body[data-theme=dark] :is(p,li,.nav-item,.nav-label,.site-footer,.topbar-tag,.student-note,.cas-credit,.source-footnote,.read-time,.note-subject,.topic-label,.small-muted,.reader-meta,.reader-contents span,.reader-other small,.reader-body p,.reader-body li,.rail-resource,.course-progress-label,.course-code,.review-explanation,.answer-feedback p,.quiz-top,.quiz-topline,.quiz-actions>span,.setting-hint,.setting-row small,.settings-copy,.form-feedback,.search-dialog-footer,.search-result small){color:var(--text-soft)}
body[data-theme=dark] :is(.program-switch,.search-trigger,.subject-icon,.tool-card-icon,.quiz-topline,.quiz-option,.option-letter,.guide-intro,.practice-banner,.info-strip,.takeaway,.rail-links,.answer-feedback,.reading-lists,.coursework-checklist,.search-result:hover){background:var(--surface-soft);border-color:var(--border)}
body[data-theme=dark] :is(input:not([type=checkbox]):not([type=radio]),textarea,select){background:var(--surface);color:var(--text-main);border-color:var(--border)}
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body[data-theme=dark] :is(.button.secondary,.filter-chip){background:var(--surface);border-color:var(--border);color:var(--text-main)}
body[data-theme=dark] :is(.text-button,.school-link,.back-link,.reader-other a,.correct-answer,.core-card-label){color:var(--action)}
body[data-theme=dark] :is(.nav-item.active,.nav-item:hover,.filter-chip.selected,.program-switch button[aria-pressed=true],.library-tabs .selected,.quiz-option.chosen){background:#22344d;color:#a8ccff;border-color:#46628a}
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body[data-theme=dark] :is(.sidebar-bottom,.reader-contents,.reader-other,.quiz-actions,.review-card,.core-detail,.faq details,.site-footer,.library-toolbar,.settings-section-heading){border-color:var(--border)}
body[data-theme=dark] .course-shell{--subject-tint:color-mix(in srgb,var(--subject-color) 25%,#171e29);--subject-ink:color-mix(in srgb,var(--subject-color) 55%,#fff)}
body[data-theme=dark] :is(.level-switch,.course-choice select,.course-progress-chip){background:#ffffff08;border-color:#ffffff12}
body[data-theme=dark] .resource-symbol{background:#263c60;color:#a5c9ff}body[data-theme=dark] .resource-symbol.violet{background:#34304f;color:#c0b5ff}body[data-theme=dark] .resource-symbol.orange{background:#47372c;color:#eac191}body[data-theme=dark] .resource-symbol.green{background:#233d37;color:#90d8bd}body[data-theme=dark] .resource-symbol.rose{background:#472f3b;color:#f2a1bb}body[data-theme=dark] .resource-symbol.purple{background:#3b2f4f;color:#d1adf3}
body[data-theme=dark] .welcome-banner.welcome-classic{background:linear-gradient(120deg,#182e43,#1b2b41 58%,#193b56)}body[data-theme=dark] .welcome-classic h1{color:#e8eef8}body[data-theme=dark] .welcome-classic h1 span{color:#83caff}body[data-theme=dark] .welcome-classic .welcome-kicker{color:#9bd8f9}body[data-theme=dark] .welcome-classic p{color:#a6bfd2}body[data-theme=dark][data-program=cp] .welcome-banner.welcome-classic{background:linear-gradient(120deg,#18392d,#1d302e 58%,#214737)}body[data-theme=dark][data-program=cp] .welcome-classic h1 span{color:#8cdcc1}
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body[data-theme=dark] :is(.career-option,.career-sequence){background:var(--surface);border-color:var(--border)}body[data-theme=dark] .career-option.selected{background:#1d3d35;border-color:#459a80}body[data-theme=dark] .career-option strong{color:var(--text-main)}body[data-theme=dark] :is(.career-option small,.career-option em,.career-sequence strong){color:var(--text-soft)}
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@media(max-width:850px){.topbar .brand{width:auto}.course-shell{margin:20px}.course-title-row h1{font-size:28px}.resource-launch-grid{grid-template-columns:1fr}.resource-launch{padding:14px 3px}.resource-launch p{max-width:none}.resource-symbol{width:60px;height:60px}.resource-launch h3{font-size:17px}.resource-launch p{font-size:12px}.plan-topics{grid-template-columns:1fr}}
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body[data-theme=dark] .course-hero{background:linear-gradient(180deg,color-mix(in srgb,var(--subject-color) 25%,#171e29),var(--surface) 93%)}
body[data-theme=dark] :is(.account-trigger,.toast){background:var(--surface-soft);color:var(--text-main);border-color:var(--border)}
body[data-theme=dark] .account-trigger:hover{background:#29364a}
@media(max-width:650px){.topbar .search-trigger{min-width:0;width:32px;flex:0 0 32px;background:none;border:0;padding:6px}.topbar-left{display:none}.topbar{gap:11px}.topbar .account-trigger{margin-left:auto}.topbar .brand{flex-shrink:0}.topbar>#menu-button{margin-left:0}}
body[data-theme=dark] :is(.school-resource-card,.empty-state,.recall details,.bottom-strip,.program-comparison article){background:var(--surface);border-color:var(--border)}
body[data-theme=dark] :is(.dashboard-tools a,.auth-notice,.account-storage,.settings-section-heading>svg,.search-trigger kbd,.library-active>span,.recent-practice a:hover){background:var(--surface-soft);color:var(--text-soft);border-color:var(--border)}
body[data-theme=dark] :is(.school-resource-card:hover,.icon-button:hover,.subject-choices label:has(input:checked)){background:#22344d;border-color:#46628a;color:#a8ccff}
body[data-theme=dark] :is(.school-resource-card h2,.subject-choices label,.auth-tabs .selected){color:var(--text-main)}
body[data-theme=dark] .subject-choices label{border-color:var(--border)}
body[data-theme=dark] .result-tag.right{background:#244234;color:#b2e1ce}body[data-theme=dark] .result-tag.review{background:#462c30;color:#f5c0c8}